The stub shaft bearing for a stub shaft can be replaced while the stub shaft remains installed in a hydroelectric unit. A runner hub lifting device may be positioned within a discharge ring surrounding a runner hub. The runner hub lifting device may lift the runner hub, and a stub shaft bearing may be removed from a stub shaft. The stub shaft bearing may be disassembled into bearing sections while located in a chamber in the hydroelectric unit. The bearing sections may be removed from the chamber through a service hatch in the chamber. A replacement stub shaft bearing may be moved into the chamber and installed on the stub shaft. The runner hub lifting device may lower the runner hub.

The stub shaft bearing for a stub shaft can be replaced while the stub shaft remains installed in a hydroelectric unit. A runner hub lifting device may be positioned within a discharge ring surrounding a runner hub. The runner hub lifting device may lift the runner hub, and a stub shaft bearing may be removed from a stub shaft. The stub shaft bearing may be disassembled into bearing sections while located in a chamber in the hydroelectric unit. The bearing sections may be removed from the chamber through a service hatch in the chamber. A replacement stub shaft bearing may be moved into the chamber and installed on the stub shaft. The runner hub lifting device may lower the runner hub.

A rotor bearing assembly for an underwater generator of a fluid flow power plant includes a hollow cylindrical bearing carrier configured to be inserted into an interior of a rotor and releasably connected to the rotor such that they rotate together and an axle journal extending into an interior of the bearing carrier and rotatably supporting the bearing carrier. The bearing the axle journal and the bearing carrier are configured as an installation unit such that a portion of the bearing carrier is insertable into the rotor interior and removable from the rotor interior while attached to the axle journal. Also a generator including the rotor bearing assembly.

The stub shaft bearing for a stub shaft can be replaced while the stub shaft remains installed in a hydroelectric unit. A runner hub lifting device may be positioned within a discharge ring surrounding a runner hub. The runner hub lifting device may lift the runner hub, and a stub shaft bearing may be removed from a stub shaft. The stub shaft bearing may be disassembled into bearing sections while located in a chamber in the hydroelectric unit. The bearing sections may be removed from the chamber through a service hatch in the chamber. A replacement stub shaft bearing may be moved into the chamber and installed on the stub shaft. The runner hub lifting device may lower the runner hub.

The stub shaft bearing for a stub shaft can be replaced while the stub shaft remains installed in a hydroelectric unit. A runner hub lifting device may be positioned within a discharge ring surrounding a runner hub. The runner hub lifting device may lift the runner hub, and a stub shaft bearing may be removed from a stub shaft. The stub shaft bearing may be disassembled into bearing sections while located in a chamber in the hydroelectric unit. The bearing sections may be removed from the chamber through a service hatch in the chamber. A replacement stub shaft bearing may be moved into the chamber and installed on the stub shaft. The runner hub lifting device may lower the runner hub.

An electromagnetic turbine system includes a circulation system for recirculating fluid that drives turbine impellers for electromagnetic turbine modules. The circulation system includes a fluid separator module which separates gas from liquid and circulates the liquid back to a pressure chamber. The liquid in the pressure chamber is propel by compressed gas. Multiple pressure chambers may be controlled to release pressurized fluid to drive their respective shafts on a staggered timing sequence. The turbine modules may be levitated from a supporting surface to reduce friction.

An electromagnetic turbine system includes a circulation system for recirculating fluid that drives turbine impellers for electromagnetic turbine modules. The circulation system includes a fluid separator module which separates gas from liquid and circulates the liquid back to a pressure chamber. The liquid in the pressure chamber is propel by compressed gas. Multiple pressure chambers may be controlled to release pressurized fluid to drive their respective shafts on a staggered timing sequence. The turbine modules may be levitated from a supporting surface to reduce friction.

Systems and method for a hydrokinetic energy device. A hydrokinetic energy device includes a main body including two main wing-shaped spars mounted upon a rotating central hub, and rotatable spar tip turbines mounted at or near an end of each of the main wing-shaped spars, the main wing-shaped spars driving the rotatable spar tip turbines through water, each of the rotatable spar tip turbines including a direct-drive generator and power conversion system that transfers power from a rotating rotatable spar tip turbine to the central hub where the voltage is stepped up and amperage is reduced.

Systems and method for a hydrokinetic energy device. A hydrokinetic energy device includes a main body including two main wing-shaped spars mounted upon a rotating central hub, and rotatable spar tip turbines mounted at or near an end of each of the main wing-shaped spars, the main wing-shaped spars driving the rotatable spar tip turbines through water, each of the rotatable spar tip turbines including a direct-drive generator and power conversion system that transfers power from a rotating rotatable spar tip turbine to the central hub where the voltage is stepped up and amperage is reduced.

The present invention provides an adaptive hydroelectric turbine system comprising a base for a hydroelectric turbine or other electrical component, the base having four ground contacting feet, at least one of which is displaceable relative to the remaining of the base such as to ensure that all four feet can contact the seabed to provide improved stability and load bearing capabilities.